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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b4b8f6c02b6a1439f1344658cd93611b87d0e2b32ea3ab5c5d6e883c6d0357d' 
  AND token = '32jMPMC5pTfBpU/UvVdvLR6xPECfLUI1l5J9uUA6c20=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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