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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c30f5558b68e2b2318390a030d43e4272efd6cc67ce83f5efd6ea5d93ba02146' 
  AND token = 'AO5ClAXBMuxEdPgZmf535DPIEq/M2fdH2VgWmI2EfMM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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