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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f191ec31f3f09c6c30d2f4aeab34598d6e1bc7dc6ba4549b338b3315fb0ae5fe' 
  AND token = '7MuDgCadWOcUzkm7nliW7m4Aahot1nxystOO5YB/bNU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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