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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4e0dc9c46c9217c1f4f6afa52d4a63bf3ccc3c18dd0a78caeadf4ba18e53a2d' 
  AND token = 'Lk9lEk4k/qOmpjbT6h/GYvXaozEMUS5b71YwWmd1Ccg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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