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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '084a81d5a3cfd825bd623293026ef110e18c3d8a6ec3e4f3050cc86b89e46ee6' 
  AND token = 'GGkw1AuILSqIUXYzv9/t47nYuT6iaNYFRtu1+CRf8v0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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