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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '615c6d57c2f8395a50bb31578ddfed64c1d54c6474b7a9b15b581e45a8c3ab89' 
  AND token = 'LCaCClvSxIdqjriXYl6aMsi0skPNzAT3y5uC7//HsN8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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