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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26f24e4bfd22b652f351e1c795600f2bf37ad184fd3a7fcfe96f88c99b7292d7' 
  AND token = 'h+BIIk7DSn01CfZETPktSycBWJmoeOmQilMHmCI/SNY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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