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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10fc946f563626f626f8776f91d0dc2743d676b868693e7946ff4784219e3c1e' 
  AND token = 'C66b42PwHTtEfud+YUKXaXgEpmcLK+unR2CEiQV+iWU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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