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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11d07442c32f478ec48aa7d93daf13517bce26642fff0007f5c69eeeb54533a9' 
  AND token = 'ign/Nj5t8ckFQgRbQqeuMmERr0KXCyWhv3zMEdPr3PE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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