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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea5fe6c774f23ad603c06847ae55b636ea59717bbc29a5d6c8a91a7bc0262b3a' 
  AND token = 'Ut2kw72IgPhsxXNtZc7iJWiDSnZpIWQbcS457C+UTRQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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