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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8fa498bcdddc90c270c7d3f8932f33e7b6b40f18f378b31559e041bb417c537' 
  AND token = 'GauDjLrlFPrudRYAJ1U2AbJ6of50rIt03JffwLVMLC8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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