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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18142eefb301d8da709ef2c6a230125148546854718371975e6d49e366bc0918' 
  AND token = 'X9k2d69vS6BzdnuS6tjkkFYU0jSQX2Nby16xv8Y1Tc4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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