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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a255d7da3f6037746e8654863463fc94a997cf0f868d386e6e050abb21610e03' 
  AND token = 'g+9bGdirhzbLE57O873Pahm652bHDHyIUjnrA3w4On8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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