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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb1ec25021767764d6c67669c8d00b1bb23a266acb9e431ea6437b84b64f2f47' 
  AND token = 'x7pwDPqtuEeGkUO+Ky0t/JrS19z1mPqj56S/77Kas5A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00080

JSON explain

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