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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d7c0d6bb41a9a51c50502899f7a557dd8c963cf7b29579b283cb62e5a303646' 
  AND token = 'A4qPi8cyY4rnukBccfKBXn93ogfu1J7udqgPpF5cdM4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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