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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adaf224386f9fcc6efdde1cb1873e799ac602a05987c7442cbd616d322c9079a' 
  AND token = 'vGWat/6r8cO5+9OUh4Saib1XUIU+JjjHH276F0ax1Lc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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