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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a0d9a55785a135af31409773bb1bc4bab523854b8fb5c3d7e379721520d7907' 
  AND token = 'hxYh+QxFMF2qkLq/ufHcHRbYY0Qo8q2fCVaXJvNDpPY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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