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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce4ebc4da4c83e31055b559ca254b857d816d4085e8722e5a53ca534fa20410d' 
  AND token = 'Zbc1ped0FFt50jrp/Zr7BaOPAjtOps5Y39mG8tKz7RA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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