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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0104ea26bf8abb15994ac0b9f4481fe6a8d79431eb1b76c833bcfa76e96bd544' 
  AND token = 'rL9OIIdlSeVVtjfl2kVWiQcpfxIZp7IzUSK+NtXf0IY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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