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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6933ed3a21737ff1e840c88042333af30aff0d1c18abb2d18b40dc2b36552ab' 
  AND token = 'aAHw2AawMc34dkaWTQsdwpYHqF+iLdDYd4oHa8GgPNk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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