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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f56afdfaf35872e96a1c6a16ba64dac546101d6d0c21bc834508d3720f4c103f' 
  AND token = '3aDufi4reomGiiynUH8fs1SW4W2PiLX2K+lYxFxyC+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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