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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11d892c7093eb73b4c308c64e32c564e32e1bf7ffd4af2fb46f50b3dd874d013' 
  AND token = 'rEdfpH4ScdP1NKoRtVeMXXV8iaasGKZ3SlTQ21geSVM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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