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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8624048fbba1a0e1f6c651e39897d3fcca7ccae3841b656907892aad083b884c' 
  AND token = 'fDwO2Ab/kPzY9YvSc4J4CceLbqDj3A2BNmAarwcf57A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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