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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c89ec1f259e632f5af5d835ea8c0b6ac393db4c608ae9347fcf9eb603de472e' 
  AND token = 'YyRFu8D8EoXaFX8W+LK4PrYa5ByRt1YyTiRKj2WNkSQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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