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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed06046cba6aaede2be074a9dd7b8de2c37e77c7b68435fc572fae55922f6b86' 
  AND token = 'M1dT/bYNVtDRkOO2faJfqVuraVO8lvgx8FpzF1nB74o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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