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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a0adeb05e7651f396908b696d29fa66d39885ba8872688268cd7bd5e05c005b' 
  AND token = 'n8UrAH51nE2/UAb+yZpY8JwB6Ibdigs64Ftn6hWrgYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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