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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d7e96e5d4f8b40a62ca8537577ec31ce4078813d30484fe1d9e935cb836f58e' 
  AND token = 'rXXEpvq19yqniOmp/U2YMlohinEKJYxR6t4iAVNblF0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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