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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98abe0dab0f092e4070ea46ce6dbf76c0b6e58d4d47cbb4f4d8de514d3a74fa5' 
  AND token = 'ZzAx7lKc6pIC7To7BZJQUuoK5aKYcEGPTE62itGCCHs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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