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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '550b92d92ea69c2940b2272f375f94c113cdf2e85d32ba28349a6313f842d8a0' 
  AND token = 'MrntplZqnmaMi3D1ifaXPjVEdQXx4LwCIROcBj7RJ9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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