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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4fd086f6453b007761adca3c91d79d6bcd88e9ce06a44f7b59457d2c3d64112' 
  AND token = 'AIPq8uqdnjMdb+kOiuSiwEo7gIC2k6VQkW+UHDuGAkI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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