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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52c159e51d9ca7d734da41251765c3e048f15d04d847e760f08af8cf1350a4ce' 
  AND token = 'ApthV3AphbiOjQhAORUfQ6hemPP++gRjQF1ua6VpLx8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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