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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec432c18876cfe3f3c5fb46fce463f22306f659ae202db6f55e22b5f708a8ee8' 
  AND token = 'LzYaY7neNeOXz3wcZ8X3nHeYC2ux1pu64ulSnCdE21I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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