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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d85ecff6687d6568effe769d5e8f0312db9d977ba726d4d68ccaf8a0ff7355d' 
  AND token = 'OgvT9LVnFIUwnw06rCI77DQC3lM0tAlKvoAigDQLY7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}